bug#65714: guix-copy 32-bit integer limit

[Efraim Flashner]

`guix copy` seems unable to deal with store items larger than
2**32 bytes (about 4.3 GiB).

(ins)efraim@3900XT ~$ guix copy --from=192.168.1.196 
/gnu/store/0f8pgl9cyh8bknl50nw6yj9wykzm6ymc-texlivetexmf-20230313
retrieving 1 store item from '192.168.1.196'...
guix copy: error: implementation cannot deal with > 32-bit integers

(ins)efraim@3900XT ~$ ssh 192.168.1.196 du -sch 
/gnu/store/0f8pgl9cyh8bknl50nw6yj9wykzm6ymc-texlivetexmf-20230313
7.5G    /gnu/store/0f8pgl9cyh8bknl50nw6yj9wykzm6ymc-texlivetexmf-20230313
7.5G    total

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Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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